Method, apparatus and program for alarming decrease in tire-pressure
First Claim
1. A method for alarming decrease in tire air-pressure that detects decrease in tire air-pressure using a judgment value obtained based on rotational wheel speeds obtained from tires loaded on a vehicle, the method comprising the following steps carried out using a computer:
- detecting the rotational wheel speeds of respective tires when the vehicle turns round a corner,calculating a vehicle speed from the rotational wheel speeds of respective tires,detecting a yaw rate of the vehicle,detecting acceleration to a lateral direction by a lateral directional acceleration sensor,estimating a bank angle at the corner during turning using the yaw rate, the vehicle speed and the lateral directional acceleration of the vehicle,calculating the judgment value from the rotational wheel speeds of respective tires,preventing erroneous judgment occurring during turning round the corner with the bank angle by setting a threshold based on the estimated bank angle, andgenerating an alarm when the judgment value exceeds the threshold.
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Abstract
It is the purpose of the present invention to provide a method, apparatus and program for alarming decrease in tire air-pressure capable of precisely detecting decrease in tire air-pressure even during turning round a corner with a large bank angle.
The present invention discloses a method for alarming decrease in tire air-pressure that detects decrease in tire air-pressure using a judgment value obtained based on rotational wheel speeds obtained from tires loaded on a vehicle, comprising a step of detecting the rotational wheel speeds of respective tires when a vehicle turns round a corner, a step of calculating a vehicle speed from the rotational wheel speeds of respective tires, a step of detecting the yaw rate of the vehicle, a step of detecting acceleration to a lateral direction by a lateral directional acceleration sensor, a step of estimating a bank angle at a corner during turning using the yaw rate, vehicle speed and lateral directional acceleration of the vehicle, a step of calculating a judgment value from the rotational wheel speeds of respective tires and a step of preventing erroneous judgment occurring during turning round a corner with a bank angle based on the estimated bank angle.
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Citations
3 Claims
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1. A method for alarming decrease in tire air-pressure that detects decrease in tire air-pressure using a judgment value obtained based on rotational wheel speeds obtained from tires loaded on a vehicle, the method comprising the following steps carried out using a computer:
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detecting the rotational wheel speeds of respective tires when the vehicle turns round a corner, calculating a vehicle speed from the rotational wheel speeds of respective tires, detecting a yaw rate of the vehicle, detecting acceleration to a lateral direction by a lateral directional acceleration sensor, estimating a bank angle at the corner during turning using the yaw rate, the vehicle speed and the lateral directional acceleration of the vehicle, calculating the judgment value from the rotational wheel speeds of respective tires, preventing erroneous judgment occurring during turning round the corner with the bank angle by setting a threshold based on the estimated bank angle, and generating an alarm when the judgment value exceeds the threshold.
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2. An apparatus for alarming decrease in tire air-pressure that detects in tire air-pressure using a judgment value obtained based on rotational wheel speeds obtained from tires loaded on a vehicle, comprising
a means of detecting the rotational wheel speeds of respective tires when the vehicle turns round a corner, a means of calculating a vehicle speed from the rotational wheel speeds of respective tires, a means of detecting a yaw rate of the vehicle, a means of detecting acceleration to a lateral direction by a lateral directional acceleration sensor, a means of estimating a bank angle at the corner during turning using the yaw rate, the vehicle speed and the lateral directional acceleration of the vehicle, a means of calculating the judgment value from the rotational wheel speeds of respective tires, a means of preventing erroneous judgment occurring during turning round the corner with the bank angle by setting a threshold based on the estimated bank angle, and a means of generating an alarm when the judgment value exceeds the threshold.
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3. A program carried on computer-readable media for alarming decrease in tire air-pressure based on detected decrease in tire air-pressure using a judgment value based on rotational wheel speeds of wheels on a vehicle, the program, when executed, causing a computer to execute the following procedures:
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detecting the rotational wheel speeds of respective tires when the vehicle turns round a corner, calculating a vehicle speed from the rotational wheel speeds of respective tires, detecting a yaw rate of the vehicle, detecting acceleration to a lateral direction by a lateral directional acceleration sensor, estimating a bank angle at the corner during turning using the yaw rate, the vehicle speed and the lateral directional acceleration of the vehicle, calculating the judgment value from the rotational wheel speeds of respective tires, preventing erroneous judgment occurring during turning round the corner with the bank angle by setting a threshold based on the estimated bank angle, and generating an alarm when the judgment value exceeds the threshold.
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Specification
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- Resources
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Current AssigneeSumitomo Rubber Industries Limited
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Original AssigneeSumitomo Rubber Industries Limited
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InventorsMiyamoto, Kazuyoshi
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Primary Examiner(s)Pham; Toan N
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Assistant Examiner(s)MCNALLY, KERRI L
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Application NumberUS11/819,622Publication NumberTime in Patent Office1,181 DaysField of Search340/442, 340/443, 340/444, 731/46, 731/462, 731/464, 731/465, 731/468US Class Current340/442CPC Class CodesB60C 23/061 by monitoring wheel speed m...
